Radio Device Clock Deviation Management for Power Savings
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Solution Overview
Problem
Existing wireless communication systems face power consumption issues due to inadequate management of frequency offsets and temperature variations in low power clock drifts, leading to reduced battery life in mobile devices.
Innovation Solution
A radio device with a first clock unit for active mode and a second clock unit for sleep mode, which determines and indicates temperature and frequency deviations to the processor, allowing the processor to switch from sleep to active mode accordingly, using a temperature compensated MEMS oscillator and Phase-Locked Loop to compensate for frequency variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If safety margins are increased to account for temperature variation and frequency offsets, then reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic adjustment of sleep window duration based on real-time temperature measurements and frequency offset calculations. The system transitions from static safety margins to dynamic adaptation, extending sleep windows when conditions permit and shortening them when frequency drift exceeds thresholds, thereby resolving the contradiction between reliability and power consumption.
Solution Approach 2:
The system continuously monitors temperature variations and calculates frequency offsets, using this feedback to adjust sleep window duration and wake-up timing. This closed-loop control enables the system to maintain reliability while minimizing power consumption by avoiding unnecessarily early wake-ups.
2Use of energy by moving object
If sleep window duration is extended to save power, then power consumption is reduced, but frequency offset accuracy deteriorates
Solution Approach 1:
The patent performs preliminary temperature measurement and frequency offset calculation before the sleep window expires. By predicting the frequency offset at wake-up time based on temperature gradients, the system can prepare calibration data in advance, maintaining measurement accuracy even with extended sleep durations.
Solution Approach 2:
The system dynamically calculates frequency offset based on real-time temperature measurements and temperature gradient data. This dynamic approach allows the system to extend sleep windows while maintaining frequency offset accuracy through continuous environmental monitoring and predictive calculations.
3Stability of the object's composition
If temperature compensation is implemented to reduce frequency drift, then frequency stability is improved, but device complexity increases
Solution Approach 1:
The patent implements self-service temperature compensation where the low-power clock unit autonomously measures temperature, calculates frequency offsets, and provides correction data to the processor. This self-contained approach improves frequency stability without requiring complex external compensation circuits, thereby limiting the increase in device complexity.
Solution Approach 2:
The system merges temperature sensing and frequency compensation functions into the low-power clock unit itself. By combining these functions in a single integrated unit rather than separate components, the patent achieves frequency stability through temperature compensation while minimizing the increase in overall device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution extends the sleep window duration, reduces power consumption, and ensures timely wake-up to avoid missed paging channel monitoring, thereby enhancing battery operation time and reducing current consumption.
Implementation Method 1
using a temperature compensated MEMS oscillator and Phase-Locked Loop to compensate for frequency variations
Implementation Method 2
using a temperature compensated MEMS oscillator and Phase-Locked Loop to compensate for frequency variations
Data Source
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AI summary
The disclosure relates to a radio device, comprising: a first clock unit; a second clock unit configured to run at a lower clock rate than a clock rate of the first clock unit; and a processor configured to operate based on the first clock unit in an operation mode and based on the second clock unit in a sleeping mode, wherein the second clock unit is configured to determine at least one of a temperature and frequency deviation of the second clock unit and to indicate the at least one of a temperature and frequency deviation to the processor.